Origin and hysteresis of lithium compositional spatiodynamics within battery primary particles

被引：387

作者：

Lim, Jongwoo ^{[1
,2
]}

Li, Yiyang ^{[1
]}

Alsem, Daan Hein ^{[3
]}

So, Hongyun ^{[4
]}

Lee, Sang Chul ^{[1
]}

Bai, Peng ^{[5
]}

Cogswell, Daniel A. ^{[5
]}

Liu, Xuzhao ^{[1
]}

Jin, Norman ^{[1
]}

Yu, Young-sang ^{[6
]}

Salmon, Norman J. ^{[3
]}

Shapiro, David A. ^{[6
]}

Bazant, Martin Z. ^{[1
,5
,7
,8
]}

Tyliszczak, Tolek ^{[6
]}

Chueh, William C. ^{[1
,2
]}

机构：

[1] Stanford Univ, Dept Mat Sci & Engn, Stanford, CA 94305 USA

[2] SLAC Natl Accelerator Lab, Stanford Inst Mat & Energy Sci, Menlo Pk, CA 94025 USA

[3] Hummingbird Sci, Lacey, WA 98516 USA

[4] Stanford Univ, Dept Aeronaut & Astronaut, Stanford, CA 94305 USA

[5] MIT, Dept Chem Engn, Cambridge, MA 02139 USA

[6] Lawrence Berkeley Natl Lab, Adv Light Source, Berkeley, CA 94720 USA

[7] MIT, Dept Math, Cambridge, MA 02139 USA

[8] Stanford Univ, SUNCAT Interfacial Sci & Catalysis, Stanford, CA 94305 USA

来源：

SCIENCE | 2016年 / 353卷 / 6299期

关键词：

D O I：

10.1126/science.aaf4914

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

The kinetics and uniformity of ion insertion reactions at the solid-liquid interface govern the rate capability and lifetime, respectively, of electrochemical devices such as Li-ion batteries. Using an operando x-ray microscopy platform that maps the dynamics of the Li composition and insertion rate in LixFePO4, we found that nanoscale spatial variations in rate and in composition control the lithiation pathway at the subparticle length scale. Specifically, spatial variations in the insertion rate constant lead to the formation of nonuniform domains, and the composition dependence of the rate constant amplifies nonuniformities during delithiation but suppresses them during lithiation, and moreover stabilizes the solid solution during lithiation. This coupling of lithium composition and surface reaction rates controls the kinetics and uniformity during electrochemical ion insertion.

引用

页码：566 / 571

页数：2

共 3 条

[1]

[Anonymous], 2002, ADV LITHIUM ION BATT

[2] Defect chemistry of LiFePO4 [J].

Maier, Joachim ;

Amin, Ruhul .

JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 2008, 155 (04) :A339-A344

[3] In operando tracking phase transformation evolution of lithium iron phosphate with hard X-ray microscopy [J].

Wang, Jiajun ;

Chen-Wiegart, Yu-chen Karen ;

Wang, Jun .

NATURE COMMUNICATIONS, 2014, 5

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